Learn more

PI INTERNAT LTD

Overview
  • Total Patents
    18
About

PI INTERNAT LTD has a total of 18 patent applications. Its first patent ever was published in 2001. It filed its patents most often in Taiwan, United States and China. Its main competitors in its focus markets electrical machinery and energy and environmental technology are ONLINE POWER SUPPLY INC, TOSHIBA DIGITAL MEDIA ENG CORP and JITARU IONEL.

Patent filings in countries

World map showing PI INTERNAT LTDs patent filings in countries
# Country Total Patents
#1 Taiwan 12
#2 United States 4
#3 China 1
#4 United Kingdom 1

Patent filings per year

Chart showing PI INTERNAT LTDs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Ho Kwok Pun 5
#2 Cheung Chi Hung 3
#3 Tse Mansing 3
#4 Cheung Matthew 2
#5 Lou Wai Tong 1
#6 Wancheng Xie 1
#7 Matthew Cheung 1
#8 Cheung Chi-Hung 1
#9 Ding Guo-Ting 1
#10 Guobin He 1

Latest patents

Publication Filing date Title
US2010202158A1 Electric power conversion circuit having transfer gain variable by pulse-width modulation
GB0611133D0 Circuit for adjusting the output voltage of a transformer
US7227762B1 Fine-tuning circuit for the winding voltage of a transformer
TW200701591A Alternative loop charging device
US2006256598A1 Inverter device utilizing three switches controlled in a concurrent manner in a resonant transformer
CN1832321A Transverter
TW200605480A Forward converter with attached coil
TW200541408A A multi-lamp-tube driving device
TW200531621A Reel with integrated electric field shield layer and method for producing the same
US7133299B2 Zero voltage switching power conversion circuit
TW200516832A Switching type power conversion circuit
TWI228742B Hot melt breaking device
TWI220994B Transformer for driving multiple lamps
TW525340B Power factor correcting method for lower standby power and its circuit apparatus